Effect of Sodium Monocarboxylate on Water by 1P-Probing Methodology I

We modified isoperibol calorimeter (Thermometric LKB8700) to a titration calorimeter for 1P-Probing Methodology and measured HE1P in sodium acetate aqueous solutions. As a result, we confirmed that acetate acts not as a normal hydration center but like a hydrophobe. Our conjecture at the present time is that while acetate is hydrated by 4.1 molecules of water, the hydrogen bond probability of bulk water away from hydration layer is reduced as much as for the case by 1P.

(by T. Kondo & Y. Miyazaki & Y. Koga)

	Fig.1 Concentration dependence of HE1P in sodium acetate aqueous solution.
	Fig. 2 Concentration dependence of HE1P-1P in sodium acetate aqueous solution.
	Fig.3 The value of x1P of point X vs. initial concentration of sodium acetate aqueous solution. Dotted line shows the contribution of one sodium ion.